Active element for laser source, has different crystals presenting low doping at upstream face of elongated core, and absorption unit arranged in core periphery for absorbing any radiation presenting wavelength of laser radiation

摘要

The active element has an elongated core (2) with a doped matrix to absorb an incoming pumping beam (3) at an upstream face (11), to amplify a laser radiation (4). The element is formed of materials including an yttrium aluminum garnet/neodymium crystal (13) and an yttrium vanadate/neodymium crystal (14). The crystals present a longitudinal doping variation with a low doping, which is limited to a preset value, at the level of the face. An absorption unit (12A) is arranged at the periphery of the core and is formed so as to absorb any radiation presenting a wave length of the laser radiation.